22 February 2017 Divided-pulse amplification with fiber-coupled electro-optic modulators
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In this contribution, we present a spatio-temporal coherent beam combining setup in a proof-of-principle experiment with an entirely fiber-coupled front-end. Unlike in previous experiments, where the temporal pulse division was achieved using free-space optical delay lines, the pulses are taken directly from the pulse train of the oscillator. Thereby, the free-space paths and the alignment requirement are cut in half. The combination inevitably remains in free-space considering application in high-power lasers. For the combination of 4 temporally separated pulses, a combining efficiency larger than 95% is demonstrated. The efficiency is largely independent of the combined pulse energy and temporal contrasts close to the theoretically estimated maximum are reached. Potentially, this approach allows for self-optimization of the combination due to the many degrees of freedom accessible with the electro-optic modulators.
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Henning Stark, Michael Müller, Marco Kienel, Arno Klenke, Jens Limpert, Andreas Tünnermann, "Divided-pulse amplification with fiber-coupled electro-optic modulators", Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 1008308 (22 February 2017); doi: 10.1117/12.2252828; https://doi.org/10.1117/12.2252828


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